using System;

namespace _06._Easter_Decoration
{
    internal class Program
    {
        static void Main(string[] args)
        {
            double basket = 1.50;
            double wreath = 3.80;
            double chocolateBunny = 7;
            int purchasedItems = 0;
            double price = 0;

            double average = 0;

            int countClientsInTheShop = int.Parse(Console.ReadLine());

            for (int i = 1; i <= countClientsInTheShop; i++)
            {
                string line = Console.ReadLine();

                while (line != "Finish")
                {
                    switch (line)
                    {
                        case "basket":
                            price += basket;
                            purchasedItems++;
                            break;
                        case "wreath":
                            price += wreath;
                            purchasedItems++;
                            break;
                        case "chocolate bunny":
                            price += chocolateBunny;
                            purchasedItems++;
                            break;

                    }

                    line = Console.ReadLine();
                }

                if (purchasedItems % 2 == 0)
                {
                    price *= 0.80;
                    average += price;
                    Console.WriteLine($"You purchased {purchasedItems} items for {price:f2} leva.");
                }


            }
            average /= countClientsInTheShop;
            Console.WriteLine($"Average bill per client is: {average:f2} leva.");














        }
    }
}